Servo control hand grip



Sept; 15, 1959 w, REDMQND Re. 24,701

SERVO CONTROL HAND GR-IP Original Filed July 23, 1954 2 Sheets-$heet 1INVYENTOR.

4/}, may $15 AGENT Sept. 15, 1959 w. G. REDMOND SERVO CONTROL HAND GRIP2 Sheets-Sheet 2 Original Filed July 23, 1954 IN VEN TOR.

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AGENT United States Patent Ofiice Re. 24,701 Reissued Sept. 15, 1959SERVO CONTROL HAND GRIP William G. Redmond, Dallas, Tex., assignor toChance Vought Aircraft, Incorporated, Dallas, Tex., a corporation ofDelaware Original No. 2,787,746, dated April 2, 1957, Serial No.445,213, July 23, 1954. Application for reissue March .28, 1958, SerialNo. 725,478

Claims. to]. 318'19) Matter enclosed in heavy brackets appears in theoriginal patent but forms no part of this reissue specification; matterprinted in italics indicates the additions made by reissue.

The present invention pertains to a control device which governs theextent of actuation of a multiplicity of controlled elements. Morespecifically, this invention relates to an auxiliary control hand-gripdevice for a control lever whereby in addition to the control providedby the control lever, n second vernier control 'is provided by the handgrip device.

This invention is somewhat similar in appearance 'tothe lever hand gripdisclosed in US. Patent No. 2,543,450 issued February 27, 195.1. In allother respects my invention, as disclosed hereinafter is shown to be animproved, new, and useful hand grip device.

My invention is particularly suitable for use with a mechanism which maybe controlled .and operated by the selective manipulation of both leversand electrical controls :as would be the case in governing the major andminor movements of a steam shovel, or of the major and minor movementsof the control surfaces of aircraft. For simplicity, I will illustratemy auxiliary control de vice .as it may be used on an aircraft.

Briefly, the conventional aircraft is controlled by a pilot-operatedcontrol lover or wheel about two of the principal axes of the aircraft,the longitudinal axis for roll control and the transverse axis for pitchcontrol. For purposes of simplifying the control of aircraft, thecontrol lever or wheel preferably is mounted in such a manner as tocause the aircraft to move in the direction of movement .of the controllever. Actuation of the control surfaces may be .accomplished byservo-motors governed by the major control lever. To balance thecontrols, i.e., to vary the attitude of an individual control surface inorder to vary the lift produced thereby .due to changing of loads in theaircraft, or due to changing of flight attitudes :of the aircraft, trimtabs on the control surfaces are necessary, or trimming of the aircraftcan be accomplished by minor deflections of the entire control surfacewithout having trim tabs.

Previously, trim control levers or wheels have been placed at variouslocations around the pilot, as on the floor, on either or both sides ofthe pilotor on the cabin ceiling above the pilot. Thus, the pilot hasbeen required to move one hand from the throttle control to a trimcontrol lever or he has been required to change hands on the controlstick and move the hand which Was operating the control stick to thetrim control lever. This moving of the hands about in the cockpit forthe necessary trimming of the aircraft control surfaces is time-takingand requires more of the pilots attention inside the cockpit thanoutside the cockpit, which, during trimming operations, leaves thecontrol of the aircraft in a precarious or dangerous condition. Asapplied to an aircraft control system wherein a major control levergoverns a pair of control surfaces through actuators or servomotors andcontrol surface actuator levers, my auxiliary control device may he usedon the major control lever to provide an auxiliary and fine control ofthe control surfaces.

A principal object of this invention is to provide an improved finecontrol of the actuator levers governed by the major control lever.

Another object of this invention is to provide an improved, auxiliary,fine control, hand grip device for a manually operable control lever insuch a fashion that the operator may actuate the auxiliary controldevice with the same hand that he operates the control lever. Thereforethe operator is not distracted while locating and operating theauxiliary control.

A still further object of this invention is to provide an auxiliarycontrol device in the shape of a hand grip for a major control lever inwhich the exact setting or amount of Vernier adjustment put in thecontrol system by the auxiliary device is always clearly and visablyindicated on the hand grip.

Yet-another object of this invention is to provide anew auxiliarycontrol device which is more efficient, lighter in weight, moredependable, and more convenient and simpler for the operator to learnand operate.

Another object of this invention is to provide a new auxiliarycontroldevice which may be used by the operator solely for operating theactuator levers normally operated by the-control lever.

Other objects .and advantages will be apparent from the specificationand claims, and from the accompanying drawings which illustrate anembodiment of the invention.

In the drawings:

Fig. .l is a perspective view of the auxiliary control hand grip aswould appear when mounted on a manually operable lever mechanism showingthe two auxiliary control knobs rotatable, in aircraft for example, inthe direction of control desired, i.e., for roll control and .for pitchcontrol;

Fig. .2 is a [front] rear view of the auxiliary control hand grip or theportion of the hand grip facing the operator of the'control lever onwhich the hand grip may be mounted;

Pig. 3 is va sectional view taken on sectional line 3--3 on Fig. 2;

Fig. 4 is a side view of the hand grip shown in Fig. 2;

Fig. .5 is a View taken in the direction of arrows 5-5 on Fig. 4.;

Fig. 6 is a sectional view taken on sectional line 6-6 on Fig. 5.;.and

Fig. 7 is .a circuit diagram showing how the signal input of the.potentiometers in the :hand grip may provide-an auxiliary control forthe actuator levers that is controlled by the major lever.

The present invention relates to an auxiliary control hand grip devicehaving arcasing 1.0 for a manually operable lever mechanism 12. Againfor simplicity, I will describe my auxiliary control device as it may beused on an aircraft. The device may be a part of a servo trim systemwhereby a craft maybe maneuvered withoutcalling on the .majorcontrols,.thus leaving the latter free to respond to only the functions of thecourse change and attitude change for which they were designed.

The device consists of an auxiliary control hand grip 10, Figs. 1-6,having a casing .or housing constructed of any suitable material, butpreferably of a hollow, molded plastic material. An adapter 11.isprovided for attachment of the hand grip to a conventional major controllever 12, or control stick column. The novel hand grip 10, when includedin the conventional pilots stick or control wheel, incorporates into thecontrol stick grip a potentiometer 13 for proportional control of theairplanes trim about its roll axis.

Inside the casing of hand grip 10 the linear carbon potentiometer 13 ismounted on a plate 19 which is secured :in any suitable fashion to thestick. grip body, and

potentiometer 13 is used as the input control signal for a closed-looptype of control system as will be hereinafter described. While othertypes of potentiometers, proportional type signal operating means,electrical means, or operating means may be used, I have found this typeto be the most satisfactory. A shaft 17 extends upwardly frompotentiometer 13 towards the top of stick grip 10. Rigidly mounted onshaft 17, for manipulation by the operator, is a control Wheel knob 15,Figs. 1, 3, and 5. Also mounted on shaft 17 above knob 15 is a spacerwasher 21, and rubber washer 23, these parts being kept in place bycover plate 33 secured to the top surface of grip by screws 39. Theproper or desired torque for turning of the wheel knob is obtained bythe addition of washers as required, to vary the friction between wheelknob 15 and cover plate 33. Electrical leads 31, Fig. 7, extend frompotentiometer 13 to the electrical servomotor or fine trim controlclosed loop system here inafter described.

It will be understood that a portion of wheel knob 15 projects through acut-out portion of grip 10, exposing a knurled surface which can bemanipulated by the pilots thumb while his hand grasps the grip 10. Asviewed in Figs. 1 and 2, for convenience of the operator in thisillustrative example, control wheel knob 15 is positioned for rotationin a substantially horizontal plane in the casing of hand grip 10adjacent the top thereof. Minor control wheel knob 15 may, as in ourexample, be used as the fine roll control wheel knob. As shown in Figs.1 and 2, attached to the top of wheel knob 15 or formed as an integralpart thereof is a reduced diameter portion 15a calibrated to indicatevarious trim positions. This calibrated portion 15a is visible to theoperator through a suitable cutout in the back and upper portion ofcasing 10 facing the operator.

The novel hand grip 10 incorporates another potentiometer 14 into thecontrol lever or control wheel for proportional trim control of theaircraft about its pitch axis. The potentiometer 14, Fig. 6, mounted onplate 20, is used as the input control signal in a second closed-looptype of control system as will be hereinafter described. Likewise, ashaft 18 extends as viewed in Fig. 6, from potentiometer 14 toward theside of stick grip 10, at substantially right angles to shaft 17 of thefirst described potentiometer 13. Control wheel knob 16, formanipulation by the operator for trim control about the pitch axis, isrigidly mounted on shaft 18 in a similar fashion and adjacent to theroll trim wheel knob 15, but in a transverse manner thereto. Alsomounted on shaft 18 above wheel knob 16 is washer 22 and rubber washer24 held in place by cover plate 34. As shown in Figs. 1 and 2, controlwheel knob 16 is positioned for rotation in a substantially verticalplane in the casing of hand grip 10 adjacent the top thereof and exposesa knurled surface portion through a cut-out portion in grip 10. Minorcontrol wheel knob 16 is used as the fine pitch control Wheel knob. Asshown in Figs. 1 and 2, attached to the side of wheel knob 16 or formedas an integral part thereof is a reduced diameter portion 16a calibratedto indicate various trim positions. Likewise, this calibrated portion16a is visible to the operator through a suitable cutout in the back andupper portion of casing 10 facing the operator.

The major control lever 12, Figs. 1 and 7, governs the movements of themechanism to be controlled, which in my case, for illustrative purposesonly, is the power output or actuator units 37a and 37b comprising maincontrol system hydraulic servomotors 42a and 42b, respectively, foroperating actuator levers 44a and 44b, respectively, this much of thesystem being similar to that disclosed in assignees U.S. Patent No.2,685,422. It will be understood that operative connections 41a and 41bexist between the control lever 12 and the servomotors 42a and 42b,respectively, as well as connections between the servomotors and theirrespective actuator levers 44a and 44b. The actuator units 37a and 37b,both additionally include auxiliary fine control servomotors 43a and 43bgoverned by the input potentiometers, 13 and 14, respectively. It willalso be understood, that in the actuator unit 37a, a single servomotormay be included in place of the two servomotors 42a and 43a,illustrated. Likewise if so desired, one servomotor may be utilized forservomotors 42b and 43b. Actuator units 37a and 37b move or control themovement of other bodies, such as, in my illustrative example, theactuator levers 44a and 44b, respectively, and which levers areconnected to the control surfaces of an aircraft for deflection of thesame, as control surfaces 45a and 45b.

The auxiliary, or vernier control mechanisms 13, 34a, 35a, 43a, and. 14,34b, 35b, and 43b of this invention provide an additional andindependent control of the actuator levers 44a and 44b of actuator unit37a and 37b, respectively, that is more precise than the conventionalcontrol of the actuator levers provided by the major control lever 12through elements 12, 41a, 42a, 41b and 42b. Accordingly, vernier, orfine movements of the control surfaces for purposes of trimming areobtained by providing a fine or small adjustment of the controllingpower output or actuator units 37a and 37b. These trimming or minormovements are governed by my signal input potentiometers in the handgrip.

Since the circuit diagram for each of the auxiliary or fine trim controlcircuits is similar, only one circuit for one side of aircraft, forexample, is illustrated. Fig. 7 illustrates merely how a signal inputfrom potentiometer 13 in the hand grip governs the actuator lever 44a ofthe power output or actuator unit 37a through an amplifier 34a andfollow-up potentiometer 35a and servomotor 43a. As mentioned above,actuator lever 44a, in turn, performs the operation desired, which, inmy case, may be the operation of a control surface or aileron 45a.

The closed loop control system, trim servomotor 43a includes anamplifier 34a of the vacuum tube, magnetic, transistor, or combinationtype powering a linear actuator with a potentiometer follow-up 35a toform a closed loop. Fig. 7 illustrates in simplified form a preferredclosed loop system. Likewise, besides the servomotor 43b, actuator lever44b, and elevator 45b being controlled by stick 12, potentiometer 14governs the actuator lever 44b of the actuator unit 37b throughamplifier 34b and follow-up potentiometer 35b. It is further noted thatboth potentiometers 13 and 14 are linked to the electrical controlsystem, where any variation in knob setting is refiected by aproportional actuation of an actuator lever with its resultant change incontrol surface attitudes or trim settings.

An advantage of this potentiometer control system over the old beepsystem as disclosed in the foregoing mentioned U.S. Patents 2,543,450and also in 2,464,629 is that the output motors are always synchronizedwith each other. Because each motor moves an exact and equal amount froma reference point, each motor accordingly may be returned to thatreference point. Further, when the pilot moves the thumb knob control15, for example, in the stick 12 very slowly, the auxiliary servomotor43a of the actuator unit 37a is driven very slowly to keep the voltageof the follow-up potentiometer 35a just balancing out the input voltageof potentiometer 13. When the pilot moves the input control 13 veryfast, servomotor 43a of the actuator unit 37a, runs very fast. Thus theseries trim system can have a high maximum speed without affecting itsprecise positioning ability.

In operation, the actuator unit 37a with the actuator lever 44a, inaddition to being controlled by transverse movement of the major controllever 12, is also controlled or governed by an input signal frompotentiometer 13 through electrical connection 31, the strength of theinput signal being governed by rotation of the auxiliary control Wheelknob 15 by transverse movement of the operators thumb. Accordingly, afine vernier auxiliary control for roll trim is provided by thumb opserated-wheel knob15. Likewise, a separate'actuator' unit or' powersource 37b similar to 37a; in addition tobeing controlled by forward andrearward movement of the major control lever 12, may also be provided tobe controlled or governed by the input signal from potentiometer throughelectrical connection 32, the strength of the input signal beingadjusted by rotation of the auxiliary control Wheel knob 16 in itsvertical plane by movement of the" operators thumb. Similarly, a fineVernier aux-' iliary'control for pitch trim is provided by thumboperated wheel knob 16'. Both thumb wheel knobs being contiguous withthe major control lever, are accordingly conveniently located and easilylend themselves to adjustment by simple thumb movement.

A fool p-roor feature of operation and novel characteristic of myauxiliary hand grip device is that the thumb wheels are required to berotated only in the general direction of desired movement of the majorcontrol lever. I-n aircraft, this is the direction of intended movementof the airplane, i.e., to actuate the actuator lever 44a of roll controlactuator unit 372. which is normally operated by transverse movement ofthe major lever 12' to the right, for example, mere transverse righthand'movement of the operators thumb on the auxiliary roll control thumbknob 15 is necessary. Likewise, to actuate the pitch control actuator,which is normally operated by forward or rearward movement of the majorcontrol lever 12 in its vertical plane, mere rotation of the auxiliarypitclr control wheel knob 16 in its vertical plane inthe same directionof movement of the control lever is necessary by forward or rearwardmovement of the operators thumb on the auxiliary pitch control wheelthumb knob.

Various combinations of connections: between the input potentiometer, aspotentiometer 13 for example, and the actuator units having auxiliaryline control servomotors for actuating an actuator lever in each unitmay be utilized to obtain the desired manner of control. In one formeach input potentiometer may govern or connot a diiferent set ofactuator units. For example, the signals from one input potentiometermay govern a of actuator units symmetrically, i.e., with a particularsignal input, the actuator lever of one actuator unit moves iii tho-samedirection as the lever of the other unit, and the signals from a secondinput potentiometer may govern another pair of actuator unitsasymmetrically, i.e., with a particular signal input, the lever of eachactuator unit moves in the direction opposite to the other. In anotherform, a single set of actuator units may be governedby both inputpotentiometers so that the said single set of actuator units performsthe same function as the above described two sets of actuator units. Inthis form, the signals from both input potentiometers are superimposedon the same pair of output actuator units, i.e., the signal received inone actuator unit from one potentioir'ieter mixed or added to the signalreceived from the other potentiometer, and in the other actuator unitthe'signals from both potentiometers are similarly mixed or added. Ifdesirable in some installations, the linearity of the potentiometers canbe distorted by resistive loading to provide less sensitive control overregions of the trim range of high surface eifectiveness.

Each knob serves to govern an individual aircraft control surface orpair of surfaces by manipulation of the particular knob. For example,the craft may be made to climb or dive and will continue to climb ordive at an angle corresponding to the setting of the pitch trim ktiobfu'ntil the latter is returned to a central neutral position. A single:roll control knob is provided whereby the craft may be made to rotateat any desired rate. Furthermore, for a climbing or diving turn, thecorrect angle of bank as well as the necessary amount of elevator misterthat maneuver may be simultaneously introduced open operation of theroll and pitch control knobs.

From the above description, the present device deals 6 with a novel-andconvenient control unit intended for incorporation in acontrol lever,including thumb-knobs and potentiometer-s, adjustment of which may bemade in inidating and controlling desired fine reactions in the poweroutput being governed without moving the control lever.

This auxiliary control hand grip provides a potentiometer control systemthat is superior to the old auxiliary mechanical hand wheel or leversystem well as the conventional electric control systems for the reasonthat increased reliability and life of the components exceed all otherswe know of in use. Further, the resultant aux iliary installation isapproximately one third lighter than the electrical beep or switch typecontrol system described heretofore which is replaced. Rate of movementof the actuators and positioning accuracy, regardless of length ofstroke, are greatly increased due to our new servo hand grip device.

While the auxiliary control hand grip is sealed at the bottom with asuitable potting compound, 30, Fig. 3, to exclude dust, moisture, andother injurious media, and for cockpit pressurization, thepotentiometer's are replaceable.

While only oneembodiment of the invention has been shownin theaccompanying drawings, it will be evident that various modifications arepossible in the arrangement and construction of the various componentsof the mechanism without departing from the scope of the invention.-

What I claim as new and useful and desire to secure by Letters Patentis:

1-.- An auxiliary control hand grip for a manually operable levermechanism and actuator ulnit means oper able by said manually operablelever mechanism comprising, a housing mounted on the manually operablelever mechanism, [potentiometer actuating] operating means in saidhousing for governing said actuator unit means independently of saidmanually operable lever mechanism, and a [thumb] finger operatedrotatable wheel knob means for said [potentiometer actuating]- operatingmeans whereby rotational movement by the operator of said [thumb] fingeroperated wheel knob means provides fine control of said actuator uni-tmeans, the lever mechanism being movable in a first'directionforoperating the actuator unit means in a second direction, the portion ofsaid wheel knob means contacted by the finger being movable in said samefirst direction for operating the actuator unit means in said samesecond direction.

2. An auxiliary control hand grip tor a manually op erable levermechanism and a plurality of actuator units connected to and operable bysaid manually operable lever mechanism comprising, a housing mounted onthe manually operable lever mechanism, a pair of operating means in saidhousing for governing [said] the actuator units independently of themanually operable lever mechanism to a more precise extent that thecontrol of [said] the manually operable lever mechanism, and a thumboperated rotatable wheel means for each opera-ting means, the plane ofone of said wheel means being at an angle to the plane of the other ofsaid Wheel means whereby actuation of each thumb operated rotatablewheel means provides fine control of its corresponding actuator unit.

3. A auxiliary control hand grip device as set forth in claim :2 whereineach of said operating means for governing an actuator unit comprises. apotentiometer.

4. An auxiliary control hand grip for a manually operable lever meanswherein a power source is controlled by the manually operable levermeans comprising, a housing means mounted on the manually operable levermeans, potentiometer means in said housing means, said potentiometermeans governing the power source to a more precise extent than thecontrol of the manually operable lever means, and a thumb operated wheelknob means connected to said potentiometer means whereby rotationalmovement by the operator of said thumb operated wheel knob meansprovides an independent and fine control of [said] the power source, thelever means being movable in a first direction for operating the powersource ina second direction, the portion of said wheel knob meanscontacted by the thumb being movable in said same first direction foroperating the power source in said some second direction.

5. An auxiliary control hand grip for a manually operable levermechanism and actuating units controlled by said lever mechanism whichis operatively connected to the actuator units comprising, an elongatedhousing mounted on the manually operable lever mechanism, a pair ofelectrical means mounted in said housing, said electrical meansgoverning [said] the actuating units to a more precise degree than thecontrol of [said] the manua ally operable lever mechanism, and a thumboperated wheel knob operatively connected to each of said electricalmeans, the plane of one wheel knob being at an angle to the plane of theother wheel knob, whereby rotational movement by the operator of saidthumb operated wheel knobs provides fine control of [said pair of] theactuating units. a

6. An auxiliary control hand grip for a manually operable levermechanism and two power sources governed by [said] the lever mechanismwhich is operatively connected to [said] the two power sourcescomprising, an elongated housing contiguous with the manually operablelever mechanism, a pair of potentiometers mounted in said housing andeach connected to a power source for governing thereof to a more preciseextent than the control of the manually operable lever mechanism, ashaft connected to each potentiometer, and a thumb operated wheel knobmounted on each of said shafts, one of said shafts being positionedsubstantially parallel to the longitudinal axis of the hand grip and theother shaft being positioned substantially transversely of thelongitudinal axis of the hand grip, whereby rotational movement by theoperator of said thumb operated wheel knobs provides fine control of[said] the two power sources.

7. An auxiliary control hand grip for a manually operablelever mechanismwhich controls the actuation of a pair of actuator units which areoperatively connected to the manually operable lever mechanismcomprising, an elongated housing mounted on the manually operable levermechanism, a pair of electrical means mounted in said housing, theactuator units being governed by said electrical means to a more preciseextent than the control of the manually operable lever mechanism, and athumb operated wheel knob in said housing operatively connected to eachof said electrical means, one of said wheel knobs being rotatable in aplane normal to the longitudinal axis of the hand grip and the otherwheel knob being rotatable in a plane parallel to the longitudinal axisof the hand grip, whereby rotational movement by the operator of saidthumb operated wheel knobs provides fine control of [said] the pair ofactuator units.

8. An auxiliary control hand grip for a manually operable levermechanism which operates a multiplicity of actuator levers which areoperatively connected to the manually operable lever mechanismcomprising, a housing mounted on the manually operable lever mechanism,a multiplicity of potentiometer means mounted in said housing, [said]the actuator levers being governed by said potentiometer means to a moreprecise extent than the control of the lever mechanism, and a thumboperated wheel knob operatively connected to each of said potentiometermeans, one of said wheel knobs being rotatable in a plane normal to thelongitudinal axis of the hand grip and the other wheel knob beingrotatable in a plane parallel to the longitudinal axis of the hand grip,whereby rotational movement by the operator of said thumb operated wheelknobs provides fine control of [said] the actuator levers.

9. An auxiliary hollow control hand grip for a manually operable levermechanism which governs the actuation of a pair of actuator levers whichare'operatively connected to the manually operable lever mechanismcomprising, an elongated housing mounted on the manually operable lever,the bottom of said housing being sealed in an airtight manner, a pair ofPotentiometers mounted in said housing and connected to a pair of fol--low-up potentiometers connected to a pair of servomotors which areconnected to [said] the pair of actuator levers, [said] the actuatorlevers being governed by said pair of potentiometers to a more preciseextent than the control of the manually operable lever mechanism, ashaft connected to each potentiometer, and a thumb operated wheel knobmounted on each of said shafts, one of said shafts being positionedsubstantially parallel to the longitudinal axis of the hand grip and theother shaft being positioned substantially transversely of thelongitudinal axis of the hand grip, whereby rotational movement by theoperator of said thumb operated wheel knobs provides fine control of[said] the pair of actuator levers.

10. A control hand grip in combination with a manually operable levermechanism, a plurality of actuator units adapted to be connected to andoperable by said manually operable lever mechanism, a housing mounted onsaid manually operable lever mechanism, a pair of operating means insaid housing for governing the actuator units, and a thumb operatedrotatable wheel means connected to each operating means, the plane ofone of said wheel means being at an angle to the plane of the other ofsaid wheel means whereby actuation of each thumb operated rotatablewheel means provides auxiliary control of its corresponding actuatorunit.

11 A hand grip control for controlling a power source by an operatorcomprising, a housing means having a shape adapted to be gripped by theoperator's hand, a pair of finger operated wheel means on said housingmeans, the plane of one of said wheel means being at an angle to theplane of the other of said wheel means, and means controlled by saidfinger operated wheel means for generating a proportional type signal tothe power source upon rotation of said finger operated wheel means bythe operato 12. A control hand grip for a manually operable lever andactuator means operable by the manually operable lever comprising, ahousing adapted to be-mounted on the manually operable lever,potentiometer means in said housing for auxiliary control of theactuator means, and a thumb operated rotatable wheel knob meansconnected to said potentiometer means whereby rotational movement by theoperator of said thumb operated wheel knob means provides control of theactuator means, the lever being movable in a first direction foroperating the actuator means in a second direction, the portion of saidwheel knob means contacted by the thumb being movable in said same firstdirection for operating the actuator means in said same seconddirection.

13. A control hand grip for a manually operable lever meanswherein apower source is controlled by the manually operable lever meanscomprising, a housing means, proportional type signal operating means onsaid housing means, said proportional type signal operating meansgoverning the power source, and a finger operated wheel knob meansconnected to said proportional type signal operating means wherebyrotational movement by the operator of said finger operated wheel knobmeans provides control of the power source, the lever means beingmovable in a first direction for operating the power source in a seconddirection, the portion of said wheel knob means contacted by the fingerbeing movable in said same first direction for operating the powersource in said same second direction.

14. A control device for governing an actuator comprising, a movablehand grip adapted to be gripped by an operators hand for operating theactuator, finger operated means movably mounted on said hand grip, andclose-loop signal generating means connected between said fingeroperated means and the actuator, said signal generating means beingresponsive to said finger operated means for controlling the actuator,the hand grip being movable in a first direction for operating theactuator in a second direction, the portion of said finger operatedmeans contacted by the finger being movable in said same first directionfor operating the actuator in said same second direction.

15. A control hand grip for a manually operable lever means wherein apower source is controlled by the manually operable lever means andwherein the power source includes a first actuator controlled by thelever means and a second actuator, the control hand grip comprising, ahousing means, proportional type signal generating means on said housingmeans, said proportional type signal operating means governing thesecond actuator, and a finger operated wheel knob means connected tosaid proportional type signal operating means for controlling the secondactuator, the lever means being movable in a first direction foroperating the power source in a second direction, the portion of saidwheel knob means contacted by the finger being movable in said samefirst direction for operating the power source in said same seconddirection.

References Cited in the file of this patent or the original patentUNITED STATES PATENTS 1,871,274 Nielsen Aug. 9, 1932 1,909,182 LanaganMay 6, 1933 1,987,066 Kingston Jan. 8, 1935 2,373,575 Lemonier Apr. 10,1945 2,444,302 Lybarger June 29, 1948 2,464,629 Young Mar. 15, 19492,471,821 Kutzler et a1 May 31, 1949 2,543,450 Feagin Feb. 27, 19512,614,776 Rossire Oct. 21, 1952 2,659,554 Murphy Nov. 17, 1953 2,693,031Clark Nov. 2, 1954 2,707,602 Kaufman May 3, 1955

